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rio: add ^B control sequence to move cursor to output point

--- a/sys/include/keyboard.h

+++ b/sys/include/keyboard.h

@@ -45,6 +45,8 @@

 	Kscrollonedown=	KF|0x21,

 	Ksoh=	0x01,

+	Kstx=	0x02,

+	Ketx=	0x03,

 	Keof=	0x04,

 	Kenq=	0x05,

 	Kack=	0x06,

--- a/sys/man/1/rio

+++ b/sys/man/1/rio

@@ -391,7 +391,8 @@

 .PP

 Typing a left or right arrow moves the cursor one character in that direction.

 Typing an SOH character (control-A) moves the cursor to the beginning of the

-current line; an ENQ character (control-E) moves to the end.

+current line; an ENQ character (control-E) moves to the end. The STX character

+(control-B) moves the cursor to the output point.

 .PP

 Text may be moved vertically within the window.

 A scroll bar on the left of the window shows in its clear portion what fragment of the

--- a/sys/src/cmd/rio/wind.c

+++ b/sys/src/cmd/rio/wind.c

@@ -691,6 +691,10 @@

 			wsetselect(w, q0, q0);

 			wshow(w, w->q0);

 			return;

+		case Kstx:	/* ^B: output point */

+			wsetselect(w, w->qh, w->qh);

+			wshow(w, w->q0);

+			return;

 		}

 	if(w->rawing && (w->q0==w->nr || w->mouseopen)){

 		waddraw(w, &r, 1);

-- 

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